Freeze-drying process of pepper bud tea powder

Abstract

The invention relates to a freeze-drying process of pepper bud tea powder. The freeze-drying process comprises the following steps: step 1, collecting fresh pepper buds and washing; step 2, uniformly spreading the pepper buds on a freeze-drying tray, and then spraying a freeze-drying protection solution; 3, the freeze-drying tray is put into freeze-drying equipment to be pre-frozen; 4, after pre-freezing is completed, vacuum equipment is started for vacuumizing, and the temperature of freeze-drying equipment is adjusted; step 5, controlling the temperature rise of the freeze-drying equipment; step 6, taking out all freeze-drying trays, collecting freeze-dried Chinese prickly ash buds, and crushing to obtain tea powder; and step seven, sub-packaging the tea powder obtained in the step six to obtain finished products of the pepper bud tea powder. According to the method, the pepper buds are dehydrated in a freeze-drying manner, so that effective substances are prevented from being damaged by high-temperature operation or volatile oil type effective substances are prevented from being volatilized massively, the content of the effective substances in the pepper bud tea powder is ensured to the greatest extent, and the efficacy of the pepper bud tea is ensured to the greatest extent.

Description

Technical Field

[0001] The invention belongs to the field of pepper bud tea powder production, in particular to a freeze-drying process of pepper bud tea powder. Background Art

[0002] Sichuan pepper sprouts are the tender sprouts during the growth process of Sichuan pepper. They are rich in various antioxidant ingredients, such as flavonoids, which can play an antioxidant role and delay cell aging. At the same time, Sichuan pepper sprouts contain a certain amount of volatile oil components, such as limonene. Most of the volatile components (especially limonene) can effectively play antibacterial, anti-inflammatory and analgesic roles, and can effectively inhibit the growth of various bacteria and viruses, reduce inflammatory responses, and can also play a certain analgesic role, thereby relieving the pain caused by symptoms such as headaches, joint pain and muscle aches. Moreover, Sichuan pepper sprouts also contain relatively rich dietary fiber and various vitamins, which can promote gastrointestinal motility and thus improve the effect of function. At the same time, because they are rich in various vitamins, they can also enhance the activity of immune cells and improve the body's immunity.

[0003] Because Sichuan pepper buds are rich in effective substances and have multiple functions, they are currently loved by more and more people. At present, Sichuan pepper buds have been prepared into Sichuan pepper bud tea for brewing and drinking. Patent No.: 202410627286.X, title: A Sichuan pepper bud tea and its production process, and patent No.: 201910474582.X, title: A Sichuan pepper bud tea and its production process. Both patents introduce methods for preparing Sichuan pepper bud tea, but both require multiple high-temperature operations during the production process. Since Sichuan pepper buds contain multiple effective substances and a certain amount of volatile oil components, multiple high-temperature operations may destroy some of the effective substances in the Sichuan pepper buds and easily cause the volatile oil to volatilize in large quantities due to high temperature, thereby reducing the effective substance components and content in the prepared Sichuan pepper bud tea, reducing the efficacy of the Sichuan pepper bud tea. Summary of the invention

[0004] The invention provides a freeze-drying process for pepper bud tea powder, which is used to solve the defects in the prior art.

[0005] The present invention is achieved through the following technical solutions:

[0006] A freeze-drying process for pepper bud tea powder comprises the following steps:

[0007] Step 1: Collect fresh pepper sprouts and rinse them;

[0008] Step 2: Dry the remaining water stains on the fresh pepper sprouts after rinsing, evenly spread the fresh pepper sprouts on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective liquid on the fresh pepper sprouts spread on the freeze-drying tray;

[0009] Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing;

[0010] Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate the air and the temperature of the freeze-drying equipment is adjusted to allow the water contained in the pepper sprouts to sublime into a gaseous state and be extracted through the vacuum equipment;

[0011] Step 5: After step 4 is completed, the temperature of the freeze-drying equipment is controlled to increase, and during the temperature increase, the vacuum equipment is continuously opened to further sublimate and gasify the residual water;

[0012] Step 6: After freeze-drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze-drying equipment to atmospheric pressure, and then all freeze-drying trays are taken out and the freeze-dried pepper buds are collected and crushed to obtain tea powder;

[0013] Step 7: The tea powder obtained in step 6 is packaged to obtain the finished product of pepper bud tea powder.

[0014] In the freeze-drying process of the pepper bud tea powder as described above, in the step 1, the collected fresh pepper buds are first rinsed with clean water, then rinsed with 50% ethanol solution, and finally rinsed with clean water again to remove impurities and perform certain sterilization and disinfection.

[0015] In the freeze-drying process of the pepper bud tea powder as described above, the mass ratio of the spraying amount of the freeze-drying protective liquid to the pepper bud in the step 2 is 3 to 6:100, and includes the following substances in parts by weight: 1 to 10 parts of citric acid; 1 to 10 parts of glucose; and 50 to 100 parts of ultrapure water.

[0016] In the freeze-drying process of the pepper bud tea powder as described above, the pre-freezing temperature of step three is -40 to -50°C, the cooling rate of the freeze-drying equipment is 6 to 8°C / min, and the temperature is maintained for 1.5 to 2 hours after being reduced to the specified temperature.

[0017] In the freeze-drying process of the pepper bud tea powder described above, after the vacuum equipment in step 4 is turned on, the vacuum degree in the freeze-drying equipment is controlled to be 20-50 Pa.

[0018] In the freeze-drying process of the pepper bud tea powder as described above, the temperature of the freeze-drying equipment in step 4 is controlled at -35 to -45°C.

[0019] In the freeze-drying process of the pepper bud tea powder as described above, the heating rate in step five is 4-6°C / min, and the temperature is raised to 20-25°C.

[0020] In the freeze-drying process of the pepper bud tea powder as described above, the vacuum degree of the freeze-drying equipment in step 5 is 100-200 Pa.

[0021] In the freeze-drying process of the pepper bud tea powder as described above, the freeze-dried pepper buds in step six are crushed and then passed through a 500-mesh sieve.

[0022] In the freeze-drying process of the pepper bud tea powder as described above, in the step seven, sterilization is performed by irradiating with ultraviolet light with a wavelength of 250 to 270 nm for 30 to 50 minutes before packaging, and then the sealed packaging is quickly completed in a sterile environment.

[0023] The advantages of the present invention are as follows: the present invention uses a freeze-drying method to dehydrate the pepper buds, thereby avoiding the destruction of effective substances due to high-temperature operation or the volatilization of a large amount of volatile oil-type effective substances, thereby ensuring the content of effective substances in the pepper bud tea powder to the greatest extent, thereby ensuring the efficacy of the pepper bud tea to the greatest extent; at the same time, by spraying freeze-drying protective liquid, the probability of the effective substance structure of the pepper buds being destroyed during the freeze-drying process can be further reduced, thereby further increasing the content of effective substances in the pepper bud tea powder, thereby further increasing the efficacy of the pepper bud tea. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A freeze-drying process for pepper bud tea powder comprises the following steps:

[0026] Step 1: Collect fresh pepper sprouts and rinse them;

[0027] Step 2: Dry the remaining water stains on the fresh pepper sprouts after rinsing, evenly spread the fresh pepper sprouts on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective liquid on the fresh pepper sprouts spread on the freeze-drying tray;

[0028] Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing;

[0029] Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate the air and the temperature of the freeze-drying equipment is adjusted to allow the water contained in the pepper sprouts to sublime into a gaseous state and be extracted through the vacuum equipment;

[0030] Step 5: After step 4 is completed, the temperature of the freeze-drying equipment is controlled to increase, and during the temperature increase, the vacuum equipment is continuously opened to further sublimate and gasify the residual water;

[0031] Step 6: After freeze-drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze-drying equipment to atmospheric pressure, and then all freeze-drying trays are taken out and the freeze-dried pepper buds are collected and crushed to obtain tea powder;

[0032] Step 7: The tea powder obtained in step 6 is packaged to obtain the finished product of pepper bud tea powder.

[0033] Specifically, in step 1 of this embodiment, the collected fresh Zanthoxylum bungeanum buds are first rinsed with clean water, then rinsed with 50% ethanol solution, and finally rinsed with clean water again to remove impurities and perform certain sterilization and disinfection.

[0034] Specifically, the mass ratio of the spraying amount of the freeze-drying protection solution to the pepper sprouts in step 2 of this embodiment is 3 to 6:100, and includes the following substances in parts by weight: 1 to 10 parts of citric acid; 1 to 10 parts of glucose; and 50 to 100 parts of ultrapure water. While playing a freeze-drying protection role, the citric acid and glucose can also increase the taste of the pepper sprouts, making them easier to drink.

[0035] More specifically, the pre-freezing temperature of step three described in this embodiment is -40 to -50°C, the cooling rate of the freeze-drying equipment is 6 to 8°C / min, and the temperature is maintained for 1.5 to 2 hours after being reduced to the specified temperature.

[0036] More specifically, in step 4 of this embodiment, after the vacuum equipment is turned on, the vacuum degree in the freeze-drying equipment is controlled to be 20-50 Pa.

[0037] More specifically, in step 4 of this embodiment, the temperature of the freeze-drying equipment is controlled at -35 to -45°C.

[0038] Furthermore, the heating rate in step five of this embodiment is 4-6°C / min, and the temperature is raised to 20-25°C.

[0039] Furthermore, the vacuum degree of the freeze-drying equipment in step 5 described in this embodiment is 100-200Pa.

[0040] Furthermore, the freeze-dried Zanthoxylum bungeanum sprouts in step six of this embodiment are crushed and then passed through a 500-mesh sieve.

[0041] Furthermore, in step 7 of this embodiment, ultraviolet light with a wavelength of 250 to 270 nm is irradiated for 30 to 50 minutes for sterilization before packaging, and then the sealed packaging is quickly completed in a sterile environment.

[0042] Example 1

[0043] Step 1: Collect fresh pepper sprouts and rinse them with clean water, then rinse them with 50% ethanol solution, and finally rinse them with clean water again to remove impurities and perform certain sterilization and disinfection;

[0044] Step 2: siphon off the remaining water stains on the fresh pepper sprouts after rinsing, spread the fresh pepper sprouts evenly on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective solution on the fresh pepper sprouts spread on the freeze-drying tray (the mass ratio of the spraying amount of the freeze-drying protective solution to the pepper sprouts is 3 to 6:100, including the following substances in parts by weight: 2 parts of citric acid; 3 parts of glucose; 50 parts of ultrapure water);

[0045] Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing. The pre-freezing temperature is -40°C. The cooling rate of the freeze-drying equipment is 6°C / min. After the temperature is lowered to the specified temperature, maintain it for 2 hours.

[0046] Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate and the vacuum degree in the freeze-drying equipment is controlled at 25Pa, and the freeze-drying equipment is heated to -35°C and then maintained for 2 hours, so that the water contained in the pepper sprouts sublimates into gas and is extracted through the vacuum equipment;

[0047] Step 5: After step 4 is completed, the freeze-drying equipment is controlled to heat up to 20°C at a heating rate of 4°C / min. During the heating process, the vacuum equipment is continuously turned on to maintain the vacuum degree in the freeze-drying equipment at 100Pa to further sublimate and gasify the residual water;

[0048] Step 6: After freeze drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze drying equipment to atmospheric pressure, and then all freeze drying trays are taken out and the freeze dried pepper buds are collected, crushed and sieved through a 500 mesh to obtain tea powder;

[0049] Step 7: The tea powder obtained in step 6 is irradiated with ultraviolet light with a wavelength of 250nm for 45 minutes for sterilization and disinfection, and then quickly sealed and packaged in a sterile environment to obtain the finished product of the pepper bud tea powder.

[0050] Example 2

[0051] Step 1: Collect fresh pepper sprouts and rinse them with clean water, then rinse them with 50% ethanol solution, and finally rinse them with clean water again to remove impurities and perform certain sterilization and disinfection;

[0052] Step 2: Dry the remaining water stains on the fresh pepper sprouts after rinsing, evenly spread the fresh pepper sprouts on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective liquid on the fresh pepper sprouts spread on the freeze-drying tray (the mass ratio of the spraying amount of the freeze-drying protective liquid to the pepper sprouts is 3 to 6:100, including the following substances in parts by weight: 9 parts of citric acid; 8 parts of glucose; 90 parts of ultrapure water);

[0053] Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing. The pre-freezing temperature is -50°C. The cooling rate of the freeze-drying equipment is 8°C / min. After the temperature is lowered to the specified temperature, maintain it for 1.6 hours.

[0054] Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate and the vacuum degree in the freeze-drying equipment is controlled at 40Pa, and the freeze-drying equipment is heated to -45°C and then maintained for 1.5 hours, so that the water contained in the pepper sprouts sublimates into gas and is extracted through the vacuum equipment;

[0055] Step 5: After step 4 is completed, the freeze-drying equipment is controlled to heat up to 25°C at a heating rate of 6°C / min. During the heating process, the vacuum equipment is continuously turned on to maintain the vacuum degree in the freeze-drying equipment at 200Pa to further sublimate and gasify the residual water;

[0056] Step 6: After freeze drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze drying equipment to atmospheric pressure, and then all freeze drying trays are taken out and the freeze dried pepper buds are collected, crushed and sieved through a 500 mesh to obtain tea powder;

[0057] Step 7: The tea powder obtained in step 6 is irradiated with ultraviolet light with a wavelength of 270nm for 50 minutes for sterilization and disinfection, and then quickly sealed and packaged in a sterile environment to obtain the finished product of the pepper bud tea powder.

[0058] Example 3

[0059] Step 1: Collect fresh pepper sprouts and rinse them with clean water, then rinse them with 50% ethanol solution, and finally rinse them with clean water again to remove impurities and perform certain sterilization and disinfection;

[0060] Step 2: Dry the remaining water stains on the fresh pepper sprouts after rinsing, evenly spread the fresh pepper sprouts on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective liquid on the fresh pepper sprouts spread on the freeze-drying tray (the mass ratio of the spraying amount of the freeze-drying protective liquid to the pepper sprouts is 3 to 6:100, including the following substances in parts by weight: 6 parts of citric acid; 5 parts of glucose; 70 parts of ultrapure water);

[0061] Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing. The pre-freezing temperature is -46°C. The cooling rate of the freeze-drying equipment is 7°C / min. After the temperature is lowered to the specified temperature, maintain it for 1.8 hours.

[0062] Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate and the vacuum degree in the freeze-drying equipment is controlled at 35Pa, and the freeze-drying equipment is heated to -41°C and then maintained for 1.7 hours to allow the water contained in the pepper sprouts to sublime into gas and be extracted through the vacuum equipment;

[0063] Step 5: After step 4 is completed, the freeze-drying equipment is controlled to heat up to 20-3°C at a heating rate of 5°C / min. During the heating process, the vacuum equipment is continuously turned on to maintain the vacuum degree in the freeze-drying equipment at 150Pa to further sublimate and gasify the residual water;

[0064] Step 6: After freeze drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze drying equipment to atmospheric pressure, and then all freeze drying trays are taken out and the freeze dried pepper buds are collected, crushed and sieved through a 500 mesh to obtain tea powder;

[0065] Step 7: The tea powder obtained in step 6 is irradiated with ultraviolet light with a wavelength of 257 nm for 35 minutes for sterilization and disinfection, and then quickly sealed and packaged in a sterile environment to obtain the finished product of the pepper bud tea powder.

[0066] Comparison example

[0067] Step 1: Pick the pepper sprouts and clean them. The cleaning process includes: first, removing the discolored petals caused by pests and diseases and other reasons; second, removing debris; and third, cutting off broken petals;

[0068] Step 2: Place the cleaned and cared pepper sprouts in a baking oven for baking at a temperature of 75°C, and turn them back and forth during the baking process to shape the pepper sprouts. The baking process is mainly to cook the pepper sprouts.

[0069] Step 3: After the baking process, the pepper buds are subjected to a greening treatment. After the greening treatment is completed, they are spread out for cooling. The greening temperature in the greening treatment is 75° C. The greening treatment can also be carried out in a baking box or in an external device for greening. The greening treatment includes spreading, steaming, and cooling and moisture regaining.

[0070] Step 4: Place the cooled pepper buds in a tea rolling machine and roll them for 35 minutes;

[0071] Step 5: Take out the kneaded pepper sprouts and place them in a drying device for drying. After the drying is completed, let them cool and the production is completed. The drying temperature is 90°C. It should be noted that the drying process can be divided into staged drying operations, that is, the pepper sprouts are dried in multiple stages so that the moisture content of the dried pepper sprouts is less than 3%.

[0072] By testing the content of effective ingredients in Examples 1-3 and the comparative example, it can be learned that the content of effective substances in the pepper bud tea powder prepared in Examples 1-3 of the present invention is at least 30% higher than that in the comparative example, especially the volatile oil substances. The content of volatile oil substances in the pepper bud tea powder prepared in Examples 1-3 of the present invention is more than twice that of the comparative example. Therefore, the pepper bud tea powder prepared by the present invention can ensure the content of effective substances to the greatest extent, thereby improving the efficacy of pepper bud tea.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A freeze-drying process for pepper bud tea powder, characterized in that: The steps include: Step 1: Collect fresh pepper sprouts and rinse them; Step 2: Dry the remaining water stains on the fresh pepper sprouts after rinsing, evenly spread the fresh pepper sprouts on the freeze-drying tray of the freeze-drying equipment, and then evenly spray the freeze-drying protective liquid on the fresh pepper sprouts spread on the freeze-drying tray; Step 3: Place the freeze-drying tray into the freeze-drying equipment for pre-freezing; Step 4: After the pre-freezing is completed, the vacuum equipment is turned on to evacuate the air and the temperature of the freeze-drying equipment is adjusted to allow the water contained in the pepper sprouts to sublime into a gaseous state and be extracted through the vacuum equipment; Step 5: After step 4 is completed, the temperature of the freeze-drying equipment is controlled to increase, and during the temperature increase, the vacuum equipment is continuously opened to further sublimate and gasify the residual water; Step 6: After freeze-drying is completed, the vacuum equipment is turned off to restore the air pressure in the freeze-drying equipment to atmospheric pressure, and then all freeze-drying trays are taken out and the freeze-dried pepper buds are collected and crushed to obtain tea powder; Step 7: The tea powder obtained in step 6 is packaged to obtain the finished product of pepper bud tea powder.

2. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: In the step 1, the collected fresh pepper sprouts are first rinsed with clean water, then rinsed with 50% ethanol solution, and finally rinsed with clean water again to remove impurities and perform certain sterilization and disinfection.

3. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The mass ratio of the spraying amount of the freeze-dried protective solution in the step 2 to the pepper sprouts is 3-6:100, and includes the following substances in parts by weight: 1-10 parts of citric acid; 1-10 parts of glucose; and 50-100 parts of ultrapure water.

4. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The pre-freezing temperature of step three is -40 to -50°C, the cooling rate of the freeze-drying equipment is 6 to 8°C / min, and the temperature is maintained for 1.5 to 2 hours after being reduced to the specified temperature.

5. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: After the vacuum equipment in step 4 is turned on, the vacuum degree in the freeze-drying equipment is controlled to be 20-50Pa.

6. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The temperature of the freeze-drying equipment in step 4 is controlled at -35 to -45°C.

7. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The heating rate in step 5 is 4-6°C / min, and the temperature is raised to 20-25°C.

8. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The vacuum degree of the freeze-drying equipment in step 5 is 100-200 Pa.

9. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: The freeze-dried pepper sprouts in step 6 are crushed and passed through a 500-mesh sieve.

10. The freeze-drying process of the pepper bud tea powder according to claim 1, characterized in that: In the step 7, before packaging, ultraviolet light with a wavelength of 250 to 270 nm is used for sterilization for 30 to 50 minutes, and then the sealed packaging is quickly completed in a sterile environment.